Material progress toward recyclable insulation of power cables. Part 1: Polyethylene-based thermoplastic materials: Dedicated to the 80th birthday of professor Toshikatsu Tanaka

Zhang, Jun; Jiang, Pingkai; Tanaka, Toshikatsu

doi:10.1109/mei.2019.8804330

Cited by 27 publications

(11 citation statements)

References 88 publications

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“…Polypropylene (PP) is a common dielectric material usually used in radio frequency, thin-film capacitors [12], [13] as well as cables as insulating material [14]. In our previous research [15], it was found that the electrical strength of PP film could be improved by mixing with natural nano-clay at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Clay Filler on the Thermal Breakdown Mechanism and Lifespan of Polypropylene Film Under AC Fields

et al. 2020

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The wide application of nanocomposites in the insulation system has greatly contributed to the performance improvement of power equipment. However, nano fillers are not omnipotent for improving the properties of composite dielectrics. In some situations, nano-modified materials are in fact a compromise of improving some performance features while sacrificing others. In this work, the breakdown characteristics and time-to-failure of polypropylene film with nano-clay fillers have been evaluated under combined thermal stress and AC electric fields. Experiments on plain polypropylene (PP) samples have also been carried out under the same test conditions as control. Test results indicated that the time-to-failure of the samples with nano-clay filler was shorter than those without nano filler, which is different from the previous experience. SEM and EDS analyses were conducted to study how the failure mechanism had taken place in both plain polypropylene and the nano-clay filled polypropylene. The failure phenomenon in these materials can be explained by molecular thermodynamics. The main reason for the premature thermal breakdown of PP nanocomposite is essentially due to the weak coupling between nano-clay filler and polymer matrix. Finally, suggestions are proposed for nano modification methods and lifespan prediction models of composite dielectrics. INDEX TERMS Electrical insulation, thermal breakdown, polypropylene film, nanocomposites, dielectrics, time-to-failure, aging.

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Section: Introductionmentioning

confidence: 99%

Effect of Nano-Clay Filler on the Thermal Breakdown Mechanism and Lifespan of Polypropylene Film Under AC Fields

et al. 2020

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“…With the development of polymeric insulation materials, low‐density polyethylene (LDPE) and cross‐linked polyethylene (XLPE) have been widely used in HVDC cable insulation. However, due to the lower melting temperatures, LDPE does not have adequate electrical and mechanical properties and thermal stability under high temperatures [1]. XLPE, on the other hand, is manufactured through the crosslinking process of LDPE to achieve better mechanical properties and thermal stability than those of LDPE.…”

Section: Introductionmentioning

confidence: 99%

Octavinyl polyhedral oligomeric silsesquioxane on tailoring the DC electrical characteristics of polypropylene

et al. 2021

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This work reports the effect of octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) on tuning the electrical performance of polypropylene (PP). OvPOSS with different content are introduced into PP using the solution method. The microstructural morphology, crystallinity behaviour, breakdown strength, DC conductivity, space charge formation, and trapping level distribution are measured. The results indicate that the OvPOSS nanofiller can be dispersed uniformly with a doping content of 2.0 phr or less. The DC conductivity is decreased, and the breakdown strength of OvPOSS/PP nanocomposites is significantly increased. The space charge accumulation of the OvPOSS/PP nanocomposites is significantly suppressed due to the introduction of deeper traps by the OvPOSS nanofiller. Finally, the experimental results demonstrate that the OvPOSS nanofiller can greatly increase the electrical performance of the base PP and the OvPOSS/PP nanocomposites have much potential for HVDC applications. They further demonstrate that the PP is environmental-friendly due to its thermo-plastic property, which can be recycled after the manufacture.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…During the crystallization, many lamellae may grow from a single nucleus and form a spherulite within which the lamellae are radially aligned. The amorphous regions between the lamellae and spherulites, consists e.g., of chain ends or branches [3,[17][18][19]. The final insulation material consists of the dielectric (PE) and two semiconducting layers (semicon), where all three layers are usually extruded within the same production step [1].…”

Section: High-voltage Direct Current (Hvdc) Cable Insulation Material...mentioning

confidence: 99%

A Review about the Modeling and Simulation of Electro-Quasistatic Fields in HVDC Cable Systems

Jörgens

Clemens

2020

Energies

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In comparison to high-voltage alternating current (HVAC) cable systems, high-voltage direct current (HVDC) systems have several advantages, e.g., the transmitted power or long-distance transmission. The insulating materials feature a non-linear dependency on the electric field and the temperature. Applying a constant voltage, space charges accumulate in the insulation and yield a slowly time-varying electric field. As a complement to measurements, numerical simulations are used to obtain the electric field distribution inside the insulation. The simulation results can be used to design HVDC cable components such that possible failure can be avoided. This work is a review about the simulation of the time-varying electric field in HVDC cable components, using conductivity-based cable models. The effective mechanisms and descriptions of charge movement result in different conductivity models. The corresponding simulation results of the models are compared against measurements and analytic approximations. Different numerical techniques show variations of the accuracy and the computation time that are compared. Coupled electro-thermal field simulations are applied to consider the environment and its effect on the resulting electric field distribution. A special case of an electro-quasistatic field describes the drying process of soil, resulting from the temperature and electric field. The effect of electro-osmosis at HVDC ground electrodes is considered within this model.

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Material progress toward recyclable insulation of power cables. Part 1: Polyethylene-based thermoplastic materials: Dedicated to the 80th birthday of professor Toshikatsu Tanaka

Cited by 27 publications

References 88 publications

Effect of Nano-Clay Filler on the Thermal Breakdown Mechanism and Lifespan of Polypropylene Film Under AC Fields

Effect of Nano-Clay Filler on the Thermal Breakdown Mechanism and Lifespan of Polypropylene Film Under AC Fields

Octavinyl polyhedral oligomeric silsesquioxane on tailoring the DC electrical characteristics of polypropylene

A Review about the Modeling and Simulation of Electro-Quasistatic Fields in HVDC Cable Systems

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